1. For a review of critical behavior at surfaces see: Binder, K.: In: Phase transitions and critical phenomena. Domb, C., Lebowitz, J.L. (eds.), Vol. 8, pp. 1?144. London: Academic Press 1983 and Ref. 2
2. Diehl, H.W.: In: Phase transitions and critical phenomena. Domb, C., Lebowitz, J.L. (eds.), Vol. 10, pp. 75?267. London: Academic Press 1986
3. See e.g. the articles in:: Phase transitions and critical phenomena. Domb, C., Green, M.S. (eds.), Vol. 6. London: Academic Press 1976
4. Fisher, M.E.: Critical phenomena. In: Lecture Notes in Physics. Hahne, F.J.W. (eds.), Vol. 186, pp. 1?139. Berlin, Heidelberg, New York: Springer 1983
5. See e.g. the articles in:: Polarized electrons in surface physics. Feder, R. (ed.). Singapore: World Scientific 1985